(function (doc, win) {
var docEl = doc.documentElement
var resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize'
var recalc = function () {
        var clientWidth = docEl.clientWidth 
        if (!clientWidth) return
        if(clientWidth>=750){
            docEl.style.fontSize = '100px'
        }else{
            docEl.style.fontSize = 100 * (clientWidth / 750) + 'px'
        } 
    } 

if (!doc.addEventListener) return
	win.addEventListener(resizeEvt, recalc, false)
	doc.addEventListener('DOMContentLoaded', recalc, false)
})(document, window)
 
